The Mayfair Exponential Game System was introduced in the first edition of DC Heroes by Mayfair Games. The game engine was updated in the second and third editions of DC Heroes, as well the Batman Role-Playing Game. A modified version was also used in the satirical Dark Age supers game Underground.

The engine was later used in the Blood of Heroes superhero RPG, before legal issues surrounding licensing of the MEGS system itself forced Pulsar Games to shutter the game line.

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